Module build failed: TypeError: this._init is not a function

[Hugo-seth]

Error occurs when testing with mocks:

I'm using the default webpack.test.conf
The vue file:

The test file:

The dependencies:

"inject-loader": "^3.0.0",
"vue-loader": "^11.3.4"

How can I fix this ?

[egoist]

This is not related to vue-cli, please ask it on Stack Overflow or Forums.